The utility model discloses an incubator with constant temperature and humidity. The incubator with the constant temperature and humidity comprises a case body, and one or more layers of shelves arranged in an inner cavity of the case body, and further comprises a humidifier, a hygrothermograph and an ultraviolet lamp capable of lighting and sterilizing, wherein the ultraviolet lamp is arranged on the top portion of the inner cavity of the case body, the humidifier is placed on the bottom of the inner cavity of the case body, and the hygrothermograph is arranged on the shelf. The incubator with the constant temperature and humidity is additionally provided with the humidifier and the hygrothermograph and utilizes the ultraviolet lamp to sterilize bacteria. The incubator with the constant temperature and humidity is economical, practical, convenient to assemble and convenient to maintain.